I launched Just for Fun Compatibility early when I was about 24. I did all the work for this project over the course of two years, programming the software, marketing, direct mail, tech support, etc. It was great project and I sold, I think, some 2000 copies. At the end of they day, I was too young and too early. Had I waited for a few more years and moved this online match.com could have been jff.com.
Regardless, the very interesting part that came was that the matching and artificial intelligence system that I had built into the software, I later used to develop the Wizard technology for PearlsOnly.